Kevin Durant's endorsement contract with Nike expires this week.

Sources say Under Armour is preparing a robust offer to Durant. Under Armour is based in Durant's home state of Maryland.

"Nike has been a part of me ever since I was in high school and have been great since I've been in the league but I'm just going to let my team be the ones who handle that behind the scenes, I guess," Durant said. "When you look at stuff like that, it's great problems to have because people want you for what you know and do on the basketball court, the work you put in, so I'm going to continue to put my work in, let them focus on that on the other end, and we'll come together at some point."

Durant switched agents last June to become the first NBA client of Jay-Z's agency.